7.-Another cup of tea?
-No,thanks.I _______ be off.My mom is waiting for me at home.( 。
A.canB.mustC.mayD.should

分析 --再喝一杯茶嗎?
--不,謝謝.我必須走了.我媽媽在家等著我.

解答 答案:B.
can能,能夠;must一定,必須;may可以;should應(yīng)該.根據(jù)My mom is waiting for me at home,可知我媽媽在家等著我,所以我必須走了.must一定,必須.故選B.

點(diǎn)評(píng) 本題考查了情態(tài)動(dòng)詞的用法.解答時(shí)注意理解句意以及所給選項(xiàng)的意思并作出正確選擇.

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